Sequence Labeling for Parts of Speech and Named Entities

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Sequence Labeling for Parts of Speech and Named Entities Speech and Language Processing. Daniel Jurafsky & James H. Martin. Copyright © 2020. All rights reserved. Draft of December 30, 2020. CHAPTER Sequence Labeling for Parts of 8 Speech and Named Entities To each word a warbling note A Midsummer Night’s Dream, V.I Dionysius Thrax of Alexandria (c. 100 B.C.), or perhaps someone else (it was a long time ago), wrote a grammatical sketch of Greek (a “techne¯”) that summarized the linguistic knowledge of his day. This work is the source of an astonishing proportion of modern linguistic vocabulary, including the words syntax, diphthong, clitic, and parts of speech analogy. Also included are a description of eight parts of speech: noun, verb, pronoun, preposition, adverb, conjunction, participle, and article. Although earlier scholars (including Aristotle as well as the Stoics) had their own lists of parts of speech, it was Thrax’s set of eight that became the basis for descriptions of European languages for the next 2000 years. (All the way to the Schoolhouse Rock educational television shows of our childhood, which had songs about 8 parts of speech, like the late great Bob Dorough’s Conjunction Junction.) The durability of parts of speech through two millennia speaks to their centrality in models of human language. Proper names are another important and anciently studied linguistic category. While parts of speech are generally assigned to individual words or morphemes, a proper name is often an entire multiword phrase, like the name “Marie Curie”, the location “New York City”, or the organization “Stanford University”. We’ll use the named entity term named entity for, roughly speaking, anything that can be referred to with a proper name: a person, a location, an organization, although as we’ll see the term is commonly extended to include things that aren’t entities per se. POS Parts of speech (also known as POS) and named entities are useful clues to sen- tence structure and meaning. Knowing whether a word is a noun or a verb tells us about likely neighboring words (nouns in English are preceded by determiners and adjectives, verbs by nouns) and syntactic structure (verbs have dependency links to nouns), making part-of-speech tagging a key aspect of parsing. Knowing if a named entity like Washington is a name of a person, a place, or a university is important to many natural language understanding tasks like question answering, stance detec- tion, or information extraction. In this chapter we’ll introduce the task of part-of-speech tagging, taking a se- quence of words and assigning each word a part of speech like NOUN or VERB, and the task of named entity recognition (NER), assigning words or phrases tags like PERSON, LOCATION, or ORGANIZATION. Such tasks in which we assign, to each word xi in an input word sequence, a label yi, so that the output sequence Y has the same length as the input sequence X sequence labeling are called sequence labeling tasks. We’ll introduce classic sequence labeling algo- rithms, one generative— the Hidden Markov Model (HMM)—and one discriminative— the Conditional Random Field (CRF). In following chapters we’ll introduce modern sequence labelers based on RNNs and Transformers. 2 CHAPTER 8•S EQUENCE LABELING FOR PARTS OF SPEECH AND NAMED ENTITIES 8.1 (Mostly) English Word Classes Until now we have been using part-of-speech terms like noun and verb rather freely. In this section we give more complete definitions. While word classes do have semantic tendencies—adjectives, for example, often describe properties and nouns people— parts of speech are defined instead based on their grammatical relationship with neighboring words or the morphological properties about their affixes. Tag Description Example ADJ Adjective: noun modifiers describing properties red, young, awesome ADV Adverb: verb modifiers of time, place, manner very, slowly, home, yesterday NOUN words for persons, places, things, etc. algorithm, cat, mango, beauty VERB words for actions and processes draw, provide, go Open Class PROPN Proper noun: name of a person, organization, place, etc.. Regina, IBM, Colorado INTJ Interjection: exclamation, greeting, yes/no response, etc. oh, um, yes, hello ADP Adposition (Preposition/Postposition): marks a noun’s in, on, by under spacial, temporal, or other relation AUX Auxiliary: helping verb marking tense, aspect, mood, etc., can, may, should, are CCONJ Coordinating Conjunction: joins two phrases/clauses and, or, but DET Determiner: marks noun phrase properties a, an, the, this NUM Numeral one, two, first, second PART Particle: a preposition-like form used together with a verb up, down, on, off, in, out, at, by PRON Pronoun: a shorthand for referring to an entity or event she, who, I, others Closed Class Words SCONJ Subordinating Conjunction: joins a main clause with a that, which subordinate clause such as a sentential complement PUNCT Punctuation ˙, , () SYM Symbols like $ or emoji $, % Other X Other asdf, qwfg Figure 8.1 The 17 parts of speech in the Universal Dependencies tagset (Nivre et al., 2016a). Features can be added to make finer-grained distinctions (with properties like number, case, definiteness, and so on). closed class Parts of speech fall into two broad categories: closed class and open class. open class Closed classes are those with relatively fixed membership, such as prepositions— new prepositions are rarely coined. By contrast, nouns and verbs are open classes— new nouns and verbs like iPhone or to fax are continually being created or borrowed. function word Closed class words are generally function words like of, it, and, or you, which tend to be very short, occur frequently, and often have structuring uses in grammar. Four major open classes occur in the languages of the world: nouns (including proper nouns), verbs, adjectives, and adverbs, as well as the smaller open class of interjections. English has all five, although not every language does. noun Nouns are words for people, places, or things, but include others as well. Com- common noun mon nouns include concrete terms like cat and mango, abstractions like algorithm and beauty, and verb-like terms like pacing as in His pacing to and fro became quite annoying. Nouns in English can occur with determiners (a goat, its bandwidth) take possessives (IBM’s annual revenue), and may occur in the plural (goats, abaci). count noun Many languages, including English, divide common nouns into count nouns and mass noun mass nouns. Count nouns can occur in the singular and plural (goat/goats, rela- tionship/relationships) and can be counted (one goat, two goats). Mass nouns are used when something is conceptualized as a homogeneous group. So snow, salt, and proper noun communism are not counted (i.e., *two snows or *two communisms). Proper nouns, like Regina, Colorado, and IBM, are names of specific persons or entities. 8.1• (M OSTLY)ENGLISH WORD CLASSES 3 verb Verbs refer to actions and processes, including main verbs like draw, provide, and go. English verbs have inflections (non-third-person-singular (eat), third-person- singular (eats), progressive (eating), past participle (eaten)). While many scholars believe that all human languages have the categories of noun and verb, others have argued that some languages, such as Riau Indonesian and Tongan, don’t even make this distinction (Broschart 1997; Evans 2000; Gil 2000). adjective Adjectives often describe properties or qualities of nouns, like color (white, black), age (old, young), and value (good, bad), but there are languages without adjectives. In Korean, for example, the words corresponding to English adjectives act as a subclass of verbs, so what is in English an adjective “beautiful” acts in Korean like a verb meaning “to be beautiful”. adverb Adverbs are a hodge-podge. All the italicized words in this example are adverbs: Actually, I ran home extremely quickly yesterday Adverbs generally modify something (often verbs, hence the name “adverb”, but locative also other adverbs and entire verb phrases). Directional adverbs or locative ad- degree verbs (home, here, downhill) specify the direction or location of some action; degree adverbs (extremely, very, somewhat) specify the extent of some action, process, or manner property; manner adverbs (slowly, slinkily, delicately) describe the manner of some temporal action or process; and temporal adverbs describe the time that some action or event took place (yesterday, Monday). interjection Interjections (oh, hey, alas, uh, um), are a smaller open class, that also includes greetings (hello, goodbye), and question responses (yes, no, uh-huh). preposition English adpositions occur before nouns, hence are called prepositions. They can indicate spatial or temporal relations, whether literal (on it, before then, by the house) or metaphorical (on time, with gusto, beside herself), and relations like marking the agent in Hamlet was written by Shakespeare. particle A particle resembles a preposition or an adverb and is used in combination with a verb. Particles often have extended meanings that aren’t quite the same as the prepositions they resemble, as in the particle over in she turned the paper over.A phrasal verb verb and a particle acting as a single unit is called a phrasal verb. The meaning of phrasal verbs is often non-compositional—not predictable from the individual meanings of the verb and the particle. Thus, turn down means ‘reject’, rule out ‘eliminate’, and go on ‘continue’. determiner Determiners like this and that (this chapter, that page) can mark the start of an article English noun phrase. Articles like a, an, and the, are a type of determiner that mark discourse properties of the noun and are quite frequent; the is the most common word in written English, with a and an right behind. conjunction Conjunctions join two phrases, clauses, or sentences. Coordinating conjunc- tions like and, or, and but join two elements of equal status.
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